Isa 20:1-6

1In the year when King Sargon of Assyria sent his commander in chief to capture the Philistine city of Ashdod,*20:1 Ashdod was captured by Assyria in 711 b.c.2the Lord told Isaiah son of Amoz, “Take off the burlap you have been wearing, and remove your sandals.” Isaiah did as he was told and walked around naked and barefoot.

3Then the Lord said, “My servant Isaiah has been walking around naked and barefoot for the last three years. This is a sign—a symbol of the terrible troubles I will bring upon Egypt and Ethiopia.*20:3 Hebrew Cush; also in 20:5.4For the king of Assyria will take away the Egyptians and Ethiopians*20:4 Hebrew Cushites. as prisoners. He will make them walk naked and barefoot, both young and old, their buttocks bared, to the shame of Egypt.
5Then the Philistines will be thrown into panic, for they counted on the power of Ethiopia and boasted of their allies in Egypt!
6They will say, ‘If this can happen to Egypt, what chance do we have? We were counting on Egypt to protect us from the king of Assyria.’”